:root{--ink:#1a2b26;--green:#1f5b49;--green2:#2f7962;--paper:#fafbf9;--white:#fff;--line:#e6ebe7;--muted:#64716c;--gold:#e4b85b;--danger:#9a4738;--shadow:0 22px 60px #18332d1f;color:var(--ink);background:var(--paper);font-synthesis:none;font-family:Segoe UI,Microsoft YaHei,sans-serif}*{box-sizing:border-box}body{margin:0}button,input{font:inherit}button,.button{cursor:pointer;border:0;border-radius:11px;padding:11px 16px}.app{min-height:100vh}header{border-bottom:1px solid var(--line);z-index:20;background:#fff;justify-content:space-between;align-items:center;height:72px;padding:0 4vw;display:flex;position:sticky;top:0}.brand{letter-spacing:-.01em;font:700 20px system-ui,Segoe UI,Microsoft YaHei,sans-serif}.brand b{color:var(--green2)}.brand-tagline{color:var(--muted);margin-left:10px;font:400 13px/1 system-ui,sans-serif}.header-actions,.actions,.practice-head>div{align-items:center;gap:12px;display:flex}.practice-head-actions{align-items:center;gap:10px;display:flex}.status{color:var(--muted);border:1px solid var(--line);border-radius:99px;padding:7px 11px;font-size:13px}.status.on{color:var(--green);background:#eef6f1;border-color:#b9d0c7}.icon-btn{border:1px solid var(--line);width:36px;height:36px;color:var(--muted);cursor:pointer;background:0 0;border-radius:10px;justify-content:center;align-items:center;padding:0;display:inline-flex}.icon-btn:hover{color:var(--ink);background:#f0f4f1}.icon-btn.active{background:var(--green);color:#fff;border-color:var(--green)}.live-status{align-items:center;gap:7px;display:inline-flex}.status-dot{background:#b9c4be;border-radius:50%;flex:none;width:8px;height:8px}.live-listening .status-dot,.live-ai-thinking .status-dot,.live-user-speaking .status-dot{background:var(--green2)}.live-ai-speaking .status-dot,.live-connecting .status-dot,.live-reconnecting .status-dot,.live-interrupted .status-dot{background:var(--gold)}.live-error .status-dot{background:var(--danger)}.ghost{color:var(--ink);background:0 0}.secondary{color:var(--ink);background:#e7ece8}.primary{background:var(--green);color:#fff;box-shadow:0 8px 20px #1f5b492e}.primary:disabled{opacity:.45}.main{max-width:1320px;margin:auto;padding:28px 4vw}.eyebrow{letter-spacing:.12em;text-transform:uppercase;color:var(--green2);font-size:12px;font-weight:700}.main h1{letter-spacing:-.02em;margin:8px 0 12px;font:700 clamp(32px,3vw,46px)/1.12 system-ui,Segoe UI,Microsoft YaHei,sans-serif}.lead{color:var(--muted);margin:0}.positioning{gap:16px;max-width:1100px;margin-top:26px;display:flex}.positioning-block{background:var(--white);border:1px solid var(--line);border-radius:16px;flex:1;padding:22px 26px}.positioning-block:last-child{flex:1.25}.positioning-block h2{letter-spacing:.02em;margin:0 0 12px;font:700 15px system-ui,Segoe UI,Microsoft YaHei,sans-serif}.positioning-title{letter-spacing:.02em;color:var(--ink);margin:0 0 12px;font:15px/1.7 system-ui,Segoe UI,Microsoft YaHei,sans-serif}.positioning-title strong{font-weight:700}.positioning-block p{color:var(--muted);margin:0 0 8px}.positioning-block ul{color:var(--muted);margin:0;padding-left:18px;line-height:1.7}.value-list{margin:0;padding-left:0;list-style:none}.value-list li{text-wrap:pretty;margin-bottom:10px;font-size:14px;line-height:1.55}.value-list li:last-child{margin-bottom:0}.value-list strong{color:var(--ink)}.provider-bar{background:#ebe8df;border-radius:16px;gap:8px;margin-top:20px;padding:6px;display:inline-flex}.provider-bar.compact{margin-top:0;margin-bottom:14px}.provider-pill{color:var(--muted);background:0 0;border:1px solid #0000;border-radius:12px;padding:10px 14px}.provider-pill.active{background:var(--white);color:var(--ink);border-color:#d3d9d2;box-shadow:0 8px 18px #18332d14}.provider-note{background:linear-gradient(135deg,#fdf8ee,#f3f0e8);border:1px solid #ded8cb;border-radius:18px;max-width:940px;margin-top:14px;padding:16px 18px}.provider-note strong{margin-bottom:6px;font:18px Georgia,serif;display:block}.provider-note p{color:var(--muted);margin:4px 0;line-height:1.45}.prepare-grid{grid-template-columns:minmax(0,1.15fr) minmax(340px,.85fr);gap:22px;height:calc(100vh - 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